After experiencing the market turmoil of the State II or the State III, engine companies have spared no effort in developing higher-emission engines, and there are no technical problems. Insiders say: State II or the State III is changed from machinery to electric control, which is a quantum leap; State III is a quantum leap, and the latter's technical difficulty is not as large as the former, and the pressure is also smaller. .
At present, on the technical route, domestic mainstream diesel engine manufacturers have basically reached a consensus that SCR will be the main technical direction for future domestic diesel emission upgrades. Cummins, Weichai, and Yuchai have all adopted SCR technology. “The mechanical pump plus some post-processing technology can meet the national III emission, and in the national IV phase, we must rely on a more precise electronic control injection system and higher injection pressure. The cost of the electronic control injection system is higher, which makes The cost of car purchase and maintenance for users has also greatly increased, and at the same time, a complete set of post-processing equipment has been added to meet the national IV standard, and the price of post-processing systems is not low.
“Why can't we implement State IV as scheduled? At present, it is mainly oil products that fail to meet the standard, and oil products that fail to meet the targets have a great impact on China IV engines. If the quality of oil products cannot be guaranteed, there is no point in talking about the country IV.
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